weston-launch: Set all groups for user

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>

https://bugs.freedesktop.org/show_bug.cgi?id=65933
diff --git a/configure.ac b/configure.ac
index 726eb4f..0864d10 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,7 +52,7 @@
 	      [[#include <time.h>]])
 AC_CHECK_HEADERS([execinfo.h])
 
-AC_CHECK_FUNCS([mkostemp strchrnul])
+AC_CHECK_FUNCS([mkostemp strchrnul initgroups])
 
 COMPOSITOR_MODULES="wayland-server >= 1.1.90 pixman-1"